FrankYang0529 commented on code in PR #19327:
URL: https://github.com/apache/kafka/pull/19327#discussion_r2022112558


##########
clients/src/test/java/org/apache/kafka/clients/consumer/internals/FetchRequestManagerTest.java:
##########
@@ -3900,86 +3653,6 @@ private Set<Node> 
nodesRequested(List<NetworkClientDelegate.UnsentRequest> reque
             .collect(Collectors.toSet());
     }
 
-    private FetchResponse fetchResponseWithTopLevelError(TopicIdPartition tp, 
Errors error, int throttleTime) {
-        Map<TopicIdPartition, FetchResponseData.PartitionData> partitions = 
Collections.singletonMap(tp,
-                new FetchResponseData.PartitionData()
-                        .setPartitionIndex(tp.topicPartition().partition())
-                        .setErrorCode(error.code())
-                        
.setHighWatermark(FetchResponse.INVALID_HIGH_WATERMARK));
-        return FetchResponse.of(error, throttleTime, INVALID_SESSION_ID, new 
LinkedHashMap<>(partitions));
-    }
-
-    private FetchResponse 
fullFetchResponseWithAbortedTransactions(MemoryRecords records,
-                                                                   
List<FetchResponseData.AbortedTransaction> abortedTransactions,
-                                                                   Errors 
error,
-                                                                   long 
lastStableOffset,
-                                                                   long hw,
-                                                                   int 
throttleTime) {
-        Map<TopicIdPartition, FetchResponseData.PartitionData> partitions = 
Collections.singletonMap(tidp0,
-                new FetchResponseData.PartitionData()
-                        .setPartitionIndex(tp0.partition())
-                        .setErrorCode(error.code())
-                        .setHighWatermark(hw)
-                        .setLastStableOffset(lastStableOffset)
-                        .setLogStartOffset(0)
-                        .setAbortedTransactions(abortedTransactions)
-                        .setRecords(records));
-        return FetchResponse.of(Errors.NONE, throttleTime, INVALID_SESSION_ID, 
new LinkedHashMap<>(partitions));
-    }
-
-    private FetchResponse fullFetchResponse(int sessionId, TopicIdPartition 
tp, MemoryRecords records, Errors error, long hw, int throttleTime) {
-        return fullFetchResponse(sessionId, tp, records, error, hw, 
FetchResponse.INVALID_LAST_STABLE_OFFSET, throttleTime);
-    }
-
-    private FetchResponse fullFetchResponse(TopicIdPartition tp, MemoryRecords 
records, Errors error, long hw, int throttleTime) {
-        return fullFetchResponse(tp, records, error, hw, 
FetchResponse.INVALID_LAST_STABLE_OFFSET, throttleTime);
-    }
-
-    private FetchResponse fullFetchResponse(TopicIdPartition tp, MemoryRecords 
records, Errors error, long hw,
-                                            long lastStableOffset, int 
throttleTime) {
-        return fullFetchResponse(INVALID_SESSION_ID, tp, records, error, hw, 
lastStableOffset, throttleTime);
-    }
-
-    private FetchResponse fullFetchResponse(int sessionId, TopicIdPartition 
tp, MemoryRecords records, Errors error, long hw,
-                                            long lastStableOffset, int 
throttleTime) {
-        Map<TopicIdPartition, FetchResponseData.PartitionData> partitions = 
Collections.singletonMap(tp,
-                new FetchResponseData.PartitionData()
-                        .setPartitionIndex(tp.topicPartition().partition())
-                        .setErrorCode(error.code())
-                        .setHighWatermark(hw)
-                        .setLastStableOffset(lastStableOffset)
-                        .setLogStartOffset(0)
-                        .setRecords(records));
-        return FetchResponse.of(Errors.NONE, throttleTime, sessionId, new 
LinkedHashMap<>(partitions));

Review Comment:
   The `FetchResponse.of` is not used in production code, but we still need to 
use another function to replace it in test code. Probably, you can modify this 
kind of function like following and add related `client.prepareResponse` back 
in the test code.
   
   ```java
       private FetchResponse fullFetchResponse(int sessionId, TopicIdPartition 
tp, MemoryRecords records, Errors error, long hw,
                                               long lastStableOffset, int 
throttleTime) {
           return new FetchResponse(new FetchResponseData()
               .setThrottleTimeMs(throttleTime)
               .setErrorCode(Errors.NONE.code())
               .setSessionId(sessionId)
               .setResponses(List.of(
                   new FetchResponseData.FetchableTopicResponse()
                       .setTopic(tp.topic())
                       .setTopicId(tp.topicId())
                       .setPartitions(List.of(
                           new FetchResponseData.PartitionData()
                               
.setPartitionIndex(tp.topicPartition().partition())
                               .setErrorCode(error.code())
                               .setHighWatermark(hw)
                               .setLastStableOffset(lastStableOffset)
                               .setLogStartOffset(0)
                               .setRecords(records))
                       ))));
       }
   ```



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